Unfortunately what you describe would affect the user experience very badly. Having to do an extra non-trivial step (figuring out what characters there are and typing them) might turn off people from posting who would otherwise post information about themselves.
Don't look at me weird, because there's statistical truth to this. For example, internet shops have two options when asking for a credit card for purchases. Ask for the security code on the back of the card, or not ask. Obvoiusly, if they don't ask, they will have more fraud going on. However, if they do, then they add another (super simple) step to the process that might turn users off from purchasing from this site. A large internet retailer did a research study where they ran their site asking for the security code and noticed that their profits suffered more than they were suffering from the fraud before. I won't get into the details of the study, because I do not have time for this, but my point is that something as simple as this might not be a desirable addition to any website.
I think the spam posts are pretty easy to spot and avoid. I am sorry they are creating more work for Heather. Maybe adding a step to the registration process is a good idea, since it is a one time thing rather than one that you have to deal with at every post.
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